Shopping spree: The 37-year-old actress kept it black in a loose tank top, cropped leggings and black-and-white sneakers. She topped it off with a green cap and sunglasses

Ready to buy! The former Grey's Anatomy star pulled out what appeared to be a red wallet from her camel-colored leather purse

Third's the charm! The blonde beauty announced in June she was expecting her first biological child; Katherine and Josh also raise two adopted girls, Naleigh, seven, and Adalaide, four

Her two daughters, seven-year-old Naleigh and four-year-old Adalaide, were not seen with their parents, leaving the husband and wife to enjoy their alone time.

And Katherine certainly values that as she posted a selfie to her Instagram last week writing: 'I'm not a very confident selfie taker but I couldn't resist trying to capture this rare adults only moment between @joshbkelley and I as the sun sets this beautiful November evening in LA! #kidsarewatchingtv #muchneededalonetime.'

The couple - who tied the knot in 2007 - later welcomed adopted daughters Naleigh from South Korea in 2009 and Adalaide in 2012.

The 27 Dresses star announced she was pregnant with her first biological child back in June.

Alone time: The mom-of-three posted a selfie with her husband last week documenting their much-needed alone time as she wrote in the caption

Scary! The Knocked Up star posted a fun Halloween photos with her two girls

Meanwhile, the mom-to-be has been busy working on upcoming CBS drama Doubt, which also stars Laverne Cox and Elliott Gould, set to premiere in 2017.

On the upcoming series, per CBS's description, Katherine plays Sadie Ellis, a brilliant attorney at a boutique firm who starts to fall for her charismatic client, Billy Brennan, an altruistic pediatric surgeon accused of murdering his girlfriend 24 years ago.

The busy actress will also star in upcoming film Unforgettable alongside Rosario Dawson and Whitney Cummings.

Coming along nicely! Posted in September, Katherine has been also sharing tips and secrets for her fellow pregnant moms, all while filming two upcoming projects: CBS's Doubt and the film, Unforgettable